Improving the boot performance of a system can provide reduced boot wait times and a means to learn more about how certain system files and scripts interact with one another. This article attempts to aggregate methods on how to improve the boot performance of an Arch Linux system.

Compiling a Custom Kernel

Staggered spin-up

Some hardware implements staggered spin-up, which causes the OS to probe ATA interfaces serially, which can spin up the drives one-by-one and reduce the peak power usage. This slows down the boot speed, and on most consumer hardware provides no benefits at all since the drives will already spin-in immediately when the power is turned on. To check if SSS is being used:

Avoiding remounting

Thanks to mkinitcpio's fsck hook, you can avoid a possibly costly remount of the root partition by changing ro to rw on the kernel line and removing it from /etc/fstab. Options can be set with rootflags=[mount options...] on the kernel line.

You can also remove API filesystems from /etc/fstab, as systemd will mount them itself (see pacman -Ql systemd | grep '\.mount$' for a list).